The discovery shows that such objects were extremely rare in the first eras of life of the universe, the Australian Science Centre Astro3D said in a press release. It refers to a publication in the magazine”. “Nature Astronomers”.
"The results of our observations and analyses show that probably ten billion years ago, large ring galaxies met just as rarely as they are now. This does not coincide with some theories, according to which these objects were found 140 times more often in the first eras of the existence of the universe,” wrote the authors of the publication, reported BTA.
Ring galaxies originate when two large galaxies collide, one of which cuts at high speed into the other at the beginning of its formation and “punctures” it, taking matter from its center and provoking the formation of stars on its periphery. So these giant galaxies resemble giant rings of fire.
A group of astronomers under Kenneth Freeman, a lecturer at the Australian National University of Canberra, discovered the most ancient and unusual example of such a galaxy studying photographs from Hubble.
They came across two unusual objects, which received the names Ar5519 and Ji5593. The first was an annular galaxy, and the second was a galaxy that passed through it and formed a zone of emptiness at its center with a diameter of thirty thousand light-years.
By studying the spectrum of galaxies, astronomers found that we see them in the state they were in about 10.8 billion years ago, three billion years after the Big Bang. This makes Ar5519 the most ancient “ring of fire” known to date.
According to the study authors, this fact, as well as the absence of other ring galaxies in the Hubble photos, are evidence that in the early eras of the universe, ring-shaped galaxies were as rare as they are now.
Astronomers discover ancient galaxy as giant ring of fire
The Hubble Orbital Observatory received images from the most ancient galaxy, which falls to the class of so-called ring galaxies, TASS reported.tags:
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